trifocals

Английский Язык - Английский Язык

Определение trifocals в Английский Язык Английский Язык словарь

Spectacles with corrective lenses that have three different powers per eye

{i} eyeglasses with trifocal lenses, eyeglasses having lenses with three focal lengths

spectacles that have corrective lenses of three different powers for each eye

Этимология

() From tri- + focal (see focus). Coined by John Isaac Hawkins, their inventor, in 1826.